Amarok

Inspired by QuickSilver for Mac OS X, Katapult is an application launcher for KDE designed to allow faster access to applications, bookmarks, and other items. It is plugin-based, so it can launch anything that is has a plugin for. Its display is driven by plugins as well, so its appearance is completely customizable. It was inspired by Quicksilver for OS X.

Exaile is a music player aiming to be similar to KDE’s Amarok, but for GTK+ and written in Python. It incorporates many of the cool things from Amarok (and other media players) like automatic fetching of album art, handling of large libraries, lyrics fetching, artist/album information via Wikipedia, Last.fm submission support, and optional iPod support via a plugin.